10) the value of K for the reaction at 25 degrees celsius is?? (see above pictur

Question

10) the value of K for the reaction at 25 degrees celsius is?? (see above picture)

11) what is the oxidation number of sulfur in the HSO4 ion? (see above picture)

12) which substance is the reducing agent in the following reaction? (see above picture)

13) what is the coefficient of the dichomate ion when the following equation is balanced? (see above picture)

14) which transformation could take place at the anode of an electrochemical cell? (see above picture)

10) Consider the reaction: Ag+ (aq) + Cl- (aq) AgCl (s) Given the following table of thermodynamic data at 298 K: Substance | Hf"(kJ/mol) | S(J/ K. mol) Ag+ (aq) CI- (aq) AgCI(s) 105.90 167.2 127.0 73.93 56.5 96.11 The value of K for the reaction at 25 °C is A) 810 B) 1.9×10-10 C) 5.3 x 109 D) 3.7 x 1010 E) 1.8 x 104 11) What is the oxidation number of sulfur in the HS04" ion? B) +4 A) +2 C) +6 D) +1 E) -2 12) Which substance is the reducing agent in the following reaction? Fe2S3 + 12H N03 2Fe(NO3)3 + 3S + 6NO2 + 6H20 A) S B) H20 C) Fe2S3 D) HN03 E) N02 13) What is the coefficient of the dichromate ion when the following equation is balanced? Fe2+ + Cr2 072, Fe3+ + Cr3+ (acidic solution) A) 5 C) 2 E) 6 14) Which transformation could take place at the anode of an electrochemical cell? 14) A) HAs02 to As B) Cr2 072--> Cr2+ C) F2 toF- D) 02 to H20 E) None of the above could take place at the anode.

Explanation / Answer

11)

Net charge on HSO4- is -1.

oxidation number of H=+1, O = -2. Let S be x.

+1+x+4(-2)=-1

+1+x-8=-1

x=6

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